<!DOCTYPE html>
<html lang="en">
  <head>
    <meta charset="UTF-8" />
    <meta http-equiv="X-UA-Compatible" content="IE=edge" />
    <meta name="viewport" content="width=device-width, initial-scale=1.0" />
    <title>Document</title>
  </head>
  <body>
    <h1>主页</h1>
    <button>产品页</button>
    <button>用户页</button>
    <button>主页</button>
    <script>
      var btns = document.querySelectorAll("button");
      btns[0].onclick = function () {
        window.location.href = "./product.html";
      };
      btns[1].onclick = function () {
        window.location.href = "./user.html";
      };
      btns[2].onclick = function () {
        window.location.href = "./home.html";
      };
    </script>
  </body>
</html>
